Metallo mercapto compounds and process of making same



Patented Sept. 4, 1928. V

UNITED" STATES WALTER SCHOEZLER, OF BEBLIN-WESTEND, AND HANS (mono ALLABDT, O]? BERLIN- BEMCKENDOBI-WEST, GERMANY, ASSIGNOBS TO THE FIB-HI RABBI! AU]? AOTIEN (VORM. E. SGHEBING), pr BERLIN, GERMANY.

IE'L'ALLO nncmo comma AND PROCESS or name sumin Drawing. Application am February 10, 192.7, serial No. 167,351,-and in Germany rebr'w- 17, 1m.

Our invention relates to metallo mercapto compounds and to. the method of maln'ng same. Y

We have found that water-soluble metallo is mercapto compounds can be obtained, if a salt of a heavy metal is caused to act in a neutral, acid or alkaline medium on a mercapto compound, the molecule. of which contains besides sulfhydryl groups a plurality of hydroxyl groups and eventually one or more other substituents, such as for instance the aldehyde group in the case of sugars.

The new compounds, which are watersoluble in proportion to the number of hydroxyl groups, correspond to the general formula R-S-Me, wherein -R is the radicle of a compound containing several 'hydroxyl groups, while Me is a heavy metal.

Example 1.

200 ccms, water. To this solution is added a quantity of sulfurous acid, corresponding to 1 molecule, for instance 92 ccms. of a 4.4 per cent aqueous solution of sulphur dioxide. A solution of 37.7 grams otassium auribromide in 380 ccms. water is slowly added to the mixture under cooling and stirring,

which is continued until the solution has lost its color, whereupon the fourfold volume of alcohol is added to precipitate 1- auro thioglucose, which can be purified by re-dissolving in water and precipitating with alcohol.

This compound is a yellowish amorphous powder, which readily dissolves in water and is insoluble in alcohol, ether and the usual organic solvents. The percentage of gold contained therein was found to be 49.7

(calculated percentage 50.3).

The compound corresponds to the formula B-Au n /dnon \(IJHOH non The thioglucose may be replaced by mercapto sugars or other-compounds containing besides sulfhydryl groups also a plurality ofhydroxyl groups.

ccms. water is slowly added dro Example 2.

20 grams ,3-thioglucose are dissolved in 200 ccms. water and an excess of a solution of sulfurous acid, for instance 100'ccms. of 'a O=CH HOE

H- 8 -Au HOH HOE

Hl-OH is a yellowish-green powder, insoluble in orgamc solvents but readily soluble in water. The gold contents was found to beabout 49,5 per cent (calculated percentage 50.3).

Other heavy metal compounds can be produced in a similar manner.

34 grams bismuth oxide are dissolved in ccms. concentrated hydrochloric acid. This solution is allowed to slowly flow into a solution of 87 grams l-thio lucose in 100 ccms. water, the tern rature ing kept at 0 and the solution The mixture is then neutralized accurately with caustic potash and is then poured into 4 litres alcohol. The; ellowish-green powder which is precipitated, is filtered by suction and redissolved in water and precipitated with alcohol for purification. The 1-bis muth thioglucose thus obtained is'readil soluble in water, insoluble in organic so vents and contains about 25.2 per cent bismuth (calculated percentage 26.2).

cadmium salt which is thereby precipitated,

' compound correspondin found is re-di'ssolve'd in water and precipitated with alcohol for purification. The l-cadmium thioglucose thus obtained is a yellowish powder which dissolves readily in water, but only with difiiculty in alcohol and other organic solvents. Its cadmium content was The new compoundsare adapted form as pharmaceutical preparations.

Various changes may be made in the details disclosed in the foregoing specification without departing from the invention or sacrificing the advantages thereof.

We claim 1. As a new product a water-soluble me tallo mercapto compound corres onding to the general formula Res-Me, w erein R the radicle of a'compo'undcontaining, besides a sulf-hydryl group, several hydroxyl groups, while Me is a heavy metal.v

'2. As a new product'an. auro merca'pto formula R-SAu', wherein R is the radicle of a compound containing, besides a sulfhydryl group, several hydroxyl groups. 3. As a new compound -1-auro thioglucose, corresponding to the formula B-Au imon mon being a yellowish amorphous powder to'be'21.8 per cent (calculated per-1 centage 22.3).

droxyl groups.

to the general which readily dissolves in water, is insoluble in alcohol, ether and other organic solvents and contains about 50 per cent gold.

4. The method of produc n water-soluble metallo merca to compoun comprising acting with a eavy metal salt on a compound containing in its molecule besides a sulfydryl group alsoa plurality of by:

glucose comprising acting with potassium auribromide on a mixture of l-thioglucose and sulfurous acid.

. 8. The method of producing l-auro thioglucose comprising dissolving 12.5 parts by weight l-thio'glucose in 200 parts water, adding the molecular quantity of a solution. of sulphur dioxide,v introducing into the mixture a solution of 37.7 parts tassium auribromide in 380 ccms. water an precipitating with alcohol. w

In testimony whereof'we aifix our. signatures.

WALTER SGHOELLER HANS GEORG ALLARDT. 

